General Introduction to Antifoam Industries. Internal Presantation / Istanbul

Transcription

1 General Introduction to Antifoam Industries Internal Presantation / Istanbul

2 Agenda What is foam & why is it undesirable Foam Control: De-foaming, Anti-foaming & De-aeration Antifoam requirements & performance testing Antifoams formats ; performance & compatibility Which antifoam to use De aerators Competitors Market Position

3 What s foam? Oil particles in a foam A dispersion of a gas in a liquid Food processing, chemical manufacturing, fermentation, textile, adhesive manufacturing, printing inks, paints, coating and resins, wastewater management

4 Foam is a complex system; Water Surfactant Air What s foam & Antifoam? Gas Water

5 DE-foaming = knock-down of existing foam ANTI-foaming = prevention of foam formation De-aeration = coalescence of (micro)bubbles What is Foam Control?

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7 De-foaming (knock-down)

8 Anti-foaming (durability)

9 Why is foam undesirable? Excessive foam reduces productivity and quality by: Process fluctuations Poor washing, filtration and drying Reduced pumping efficiency Thermal insulation poor temperature control Floatation of solids Reducing vessel capacity Preventing distillations Increasing packaging (bottling) times...etc Foaming is inherent to many manufacturing processes, for which effective foam control is a must have because without it many processes are seriously restricted or do not function at all

10 A Perfect Antifoam Agent must be; Rapid knockdown (for spot dosing). Long durability (fewer dosing points, lower consumption). Good de-aeration Low viscosity (ease of pumping & dosing) Stability of the product as supplied (for storage) of the product as dispersed into the foamant (for effectiveness) High activity (low dosing = minimal residues) Performant in non-ionic, cationic & anionic surfactants Effective at low & high temperatures (Cloud Point effect) Effective at low & high ph Effective in high salt concentrations etc... and competitive cost-performance

11 The Antifoam Balance The mechanism of antifoams means they must be INcompatible with the foam. The more performant an antifoam, the lower its compatibility The more compatible an antifoam, the lower its performance The appropriate antifoam is a balance between these needs Compatibility Performance

12 Antifoam Selection Guide There are, however, some physical and chemical factors consistent among observations made while studying antifoams and their functionality under different conditions. DESIGN AND SELECTION (Physical Parameters of the Foam in the System:) What is the ph? What is the temperature? What is the viscosity? What is the solids content? What is the volatile content? What is the dissolved organic content, or chemical composition of the foam? Exactly which type of process is generating foam?

13 Antifoam Selection Guide PROCESSING PARAMETERS OF THE FOAMING SYSTEM What is the flow rate of the liquid? Is the foam mechanically generated? Is the foam chemically produced? Is the foam being generated during the application of your product? How will the defoamer be introduced into the foaming system? What is the starting medium of the process involved? OTHER CONCERNS Are there any Kosher or Passover requirements? Are there any FDA food clearances? Are there any EPA or other environmental restrictions? Are there any undesirable ingredients, for example silicone? Is there any chemistry incompatible with your process/product?

14 Silicone Based Antifoam Format Compounds 100% actives For non-aqueous systems Commonly diluted into solvent for dosing because they are so powerful & they may be high viscosity G 520 OG 150 Compatible concentrates e.g. a compound dispersed into a surfactant Denraw SE 680 Emulsions Typically 10-30% active Used in aqueous systems (compounds are water insoluble) Easier to dose and disperse. Safe 820 Safe 620

15 Mineral Based Antifoam Format NSE 416 NSE 408 Emulsions Typically 10-30% active Used in aqueous systems (compounds are water insoluble) Easier to dose and disperse. (ppm silicone) X (Amount of Solution to be Defoamed ) = (% Active Ingredient in Foam Control Agent ) X (10.000) Antifoam to be Added

16 De-Foamers & Antifoams De-foaming, which is the speed & extent of knock-down of existing foam, is the immediate & often dramatic visual `wow`effect, and so influence product selection although it is rarely the key factor. Overall in-use cost is generally determined by antifoam durability, i.e. how frequently the antifoam needs to be re-dosed. This may require longer-term plant trials to determine. Antifoam Safe 620 Safe 820 % actives Knockdown second Durability minutes 3:30 9:00

17 Foam Height / (mm) Competitors SHAKE TIME / (mins) Competitive Antifoam Competitive Antifoam SagTex DSA No A/F

18 Competitors Dispersibility of 3 % Antifoam in water 50 0 C Stability Compatiblity with concentrated surfactants

19 Sagtex DSA & Safe 820 SAFE 820 SAGTEX DSA Appearance White - milky Milky- soft yellowish Viscosity 250 mpas 310 mpas PH 7,6 (7-8) 7,3 (7-10) Solubility Soluble in water easily Soluble in water easily Solid content( 160 C) 30,5% 21.8 %

20 ml Sagtex DSA & Safe 820 0,00 1,00 2,00 3,00 4,00 5,00 6,00 7,00 8,00 9,00 10,0011,0012,0013,0014,0015,0016,0017,0018,0019,0020,00 Min. Sagtex DSA 0,4g/L Safe 820 0,4g/L

21 Deaerator & Antifoam Sagtex SWA

22 Deaerator & Antifoam

23 Deaerator & Antifoam

24 Deaerator & Antifoam

25 Market Position Within a series of emulsions, cost per kg antifoam active generally decreases with increasing concentration, so more concentrated seems to makes sense. But: is the dosing equipment in place to avoid wastage by overdosing? cost per kg antifoam product (as supplied) increases with concentration. The Purchaser may be focussed only on cost/delivery whereas the Plant Manager is more likely to be concerned with overall in-use cost. When foam is generated only intermittently, allowing spot dosing `as needed`, a dilute emulsion may be best. $/year $/kg

26 Prevention is better than Cure! Foam can often be prevented by appropriate system design e.g. an effluent pipe that empties sub-surface rather than pouring into a pond. Where antifoams are required, they should be dosed before the point at which foam is created and in a way that they are dispersed as unifomly as possible through-out the liquid. Anti-foaming is best, De-foaming is too late! (except where foam is only generated intermittently) Just imagine a good foam control

27 Thanks